//Global scope
           a = 1;
           { //Local scope 1
             var a; //Create empty variable in local scope 1

             {//Local scope 2
             
               //This will set variable to top-most scope which contains 
               //definition for variable, which is Local scope 1
               a = 4;
             }

             Test.AreEqual(4, a);

           }

Test.AreEqual(1, a);